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中华实验和临床感染病杂志(电子版) ›› 2021, Vol. 15 ›› Issue (06) : 409 -418. doi: 10.3877/cma.j.issn.1674-1358.2021.06.008

论著

艰难梭菌耐药基因、毒力基因分布与核心基因的功能特征
岳靖林1, 滑明溪2, 段昂2, 杜鹏程2, 霍成3, 陈晨1,()   
  1. 1. 100015 北京,北京大学地坛医院教学医院传染病研究所
    2. 100015 北京,首都医科大学附属北京地坛医院传染病研究所
    3. 037001 大同市,山西国药同煤总医院病理科
  • 收稿日期:2021-02-27 出版日期:2021-12-15
  • 通信作者: 陈晨
  • 基金资助:
    国家重点研发计划(No. 2018YFE0192500)

Characteristics of antimicrobial resistance genes, virulence genes and core genes of Clostridium difficile

Jinglin Yue1, Mingxi Hua2, Ang Duan2, Pengcheng Du2, Cheng Huo3, Chen Chen1,()   

  1. 1. Institute of Infectious Diseases, Peking University Ditan Teaching Hospital, Beijing 100015, China
    2. Institute of Infectious Diseases, Beijing Ditan Hospital, Capital Medical University, Beijing 100015, China
    3. Pathology Department, Sinopharm Tongmei General Hosptial, Datong 037001, China
  • Received:2021-02-27 Published:2021-12-15
  • Corresponding author: Chen Chen
引用本文:

岳靖林, 滑明溪, 段昂, 杜鹏程, 霍成, 陈晨. 艰难梭菌耐药基因、毒力基因分布与核心基因的功能特征[J]. 中华实验和临床感染病杂志(电子版), 2021, 15(06): 409-418.

Jinglin Yue, Mingxi Hua, Ang Duan, Pengcheng Du, Cheng Huo, Chen Chen. Characteristics of antimicrobial resistance genes, virulence genes and core genes of Clostridium difficile[J]. Chinese Journal of Experimental and Clinical Infectious Diseases(Electronic Edition), 2021, 15(06): 409-418.

目的

分析艰难梭菌基因组中耐药基因、毒力基因和核心基因的分布,明确该菌耐药和毒力的分子特征。

方法

采用Prokka和FastTree等软件分析已公布的艰难梭菌2 455个基因组的核心基因和系统发生树,并进一步采用Abricate软件和自主开发的软件解析不同核心基因组和分子分型对应的耐药基因和毒力基因的分布特征,明确耐药基因、毒力基因与基因组型的关系。

结果

基于基因组学特征,Clade Ⅳ为新发现的进化分支,Clade C-Ⅰ/Ⅱ/Ⅲ发现了新的分子分型,万古霉素耐药性的发生具有进化聚集性,临床高毒菌株的基因组分布日益广泛。核心基因组比较分析表明Clade 5中细胞运动性相关基因占比最小。

结论

通过分析已发表的艰难梭菌基因组序列,描绘该菌耐药基因、毒力基因的进化聚集性、广泛性和核心基因的功能特异性,有助于对该菌的院内传播和流行病学进行研究,为改进临床治疗策略提供更多依据。

Objective

To investigate the distribution of antibiotic resistance genes, virulence genes and core genes in Clostridium difficile (C. difficile) genomes, and to identify the molecular characteristics of antimicrobial resistance and virulence of C. difficile.

Methods

The core genes and phylogenetic tree of 2 455 C. difficile genomes were analyzed by Prokka and FastTree software. Abricate software and self-developed software were furtherly used to analyze the distribution characteristics of antibiotic resistance genes and virulence genes corresponding to different core genomes and molecular types, so as to clarify the relationship between drug resistance genes, virulence genes and genotype.

Results

Based on genomic characteristics, Clade Ⅳ is a newly discovered evolutionary branch. New molecular typings were found in Clade C-Ⅰ/Ⅱ/Ⅲ, and the occurrence of vancomycin resistance showed evolutionary aggregation. The genomes of clinical strains with high virulence were widely distributed. The comparative analysis of the core genomes showed that the proportion of cell motility related genes in Clade 5 was the smallest.

Conclusions

By analyzing the published genome sequences of C. difficile, the distributive characteristics of antimicrobial resistance genes, virulence genes and core genes were described, which could provide more basis for better understanding of the bacterium and improvement of clinical treatment strategies.

表1 艰难梭菌(2 455个)基因组的ST分型分布
图1 基于151个分子分型的艰难梭菌基因组进化及耐药基因、毒力基因的分布
表2 艰难梭菌Clade-C菌株的序列型及等位基因谱
表3 艰难梭菌151个基因组中识别的耐药基因及其耐药谱
图2 携带不同tcdA/tcdB毒力基因的艰难梭菌基因组ST型的时间分布
表4 携带不同类型tcdA/tcdB毒力基因的艰难梭菌基因组151个分子分型的分布
表5 携带不同类型毒素基因座的艰难梭菌基因组151个分子分型的分布
图3 艰难梭菌不同进化谱系核心基因组的COG功能比例分布
表6 艰难梭菌不同进化谱系核心基因组的COG功能分布
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